Rigorous at-home fitness programs can render results, may pose serious risk

... regimen of 60 to 90 minutes of exercises focused on developing core strength and balance, he said. It also includes yoga poses and uses bands and free weights. The brainchild of trainer and fitness expert Tony Horton, the P90X workout is a 90-day, ...

http://www.mercurynews.com/healthy-living/ci_24784517/rigorous-at-home-fitness-programs-can-render-results